radv: move radv_declare_shader_args() out of shader_variant_compile()
Declaring them earlier will allow us to access them in NIR. Signed-off-by:Rhys Perry <pendingchaos02@gmail.com> Reviewed-by:
Samuel Pitoiset <samuel.pitoiset@gmail.com> Reviewed-by:
Timur Kristóf <timur.kristof@gmail.com>